Subject:
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Re: 3 Section Telescopic Crane Boom
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 4 Dec 2000 13:31:09 GMT
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Viewed:
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1264 times
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"Fredrik Glöckner" wrote:
> How interesting! I've always wondered how the telescoping booms
> function. I originally thought the individual boom elements could be
> extended individually, but it appears that one of the elements control
> the other(s), as you've shown us.
It would appear that there are some very large mobile cranes which can
have independent control of each section, but it is still done with a
single hydraulic ram and appears to done under computer control. I think
the operator inputs the desired position of each section, then the
computer calculates the series of moves to achieve this. Each section is
elevated and "pinned" to the correct place by the ram, which disengages,
retracts, and then does the next section in the sequence. At least this
is my interpretation from scant evidence; a crane that appears to work in
this fashion can be found in this PDF document. It is a large download
BTW.
http://www.lwe.liebherr.com/pdf/pro1500_us.pdf
> It looks like it is fairly difficult to wire up the "cable", as you'll
> need to make sure it is tight and that it is connected to the third
> boom element at the correct length. Did you spend much time getting
> this correct?
It was a bit awkward to get it properly tensioned, aye, but I certainly
didn't spend hours getting it right :-)
Jennifer Clark
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Message is in Reply To:
 | | Re: 3 Section Telescopic Crane Boom
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| How interesting! I've always wondered how the telescoping booms function. I originally thought the individual boom elements could be extended individually, but it appears that one of the elements control the other(s), as you've shown us. It looks (...) (24 years ago, 4-Dec-00, to lugnet.technic)
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